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                货车运输                </h1>
                <p>时间限制：20s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：256MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">saffah所在的国家一共有N个城市，通过N条双向道路连接，使得城市之间两两可以到达。第i条道路连接了A[i]与B[i]，其长度为L[i] km。<br />
这些道路分为M个等级。第i条道路的等级为X[i]。在第j级道路上行驶，你的限速是V[j] km/h，并且每行驶1小时会收取W[j]元的费用。根据道路分级的意义，V[j]与W[j]都随着j单调变化，即对于1 &le; j &lt; M，满足V[j] &gt; V[j+1], W[j] &gt; W[j+1]。<br />
现在有Q辆货车需要运送货物。第k辆货车要从S[k]前往T[k]，并且其最大速度为U[k] km/h。你需要对每辆货车求出其最小运送花费。</span></p>
<p></p></p><hr/><h3>输入格式</h3><p><p><span style="font-size: medium">第一行三个整数N, M, Q。<br />
接下来N行，每行四个整数A[i], B[i], L[i], X[i]，描述了一条道路。<br />
接下来M行，每行两个整数V[j], W[j]，描述了一个道路等级的限速和费用。<br />
接下来Q行，每行三个整数S[k], T[k], U[k]，描述了一辆货车。</span></p>
<p></p></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">输出Q行，即每辆货车的最小运送花费。<br />
你可以输出任意多位的实数，只要与标准答案的相对或绝对误差不超过0.0001就算正确。</span></p>
<p></p></p><hr/><h3>样例输入</h3><pre>4 2 2
1 2 50 1
2 3 50 1
1 3 50 2
3 4 50 1
100 20
10 10
1 4 100
1 4 10

</pre><hr/><h3>样例输出</h3><pre>30
150

</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium">对于所有的数据，1 &le; N,M,Q &le; 100,000, 1 &le; A[i],B[i],S[k],T[k] &le; N, 1 &le; X[i] &le; M, 1 &le; L[i],V[j],W[j],U[k] &le; 500,000。<br />
样例解释：<br />
第一辆货车应该沿1&rarr;2&rarr;3&rarr;4行驶，共在1级道路上行驶1.5小时，收费30元。<br />
第二辆货车应该沿1&rarr;3&rarr;4行驶，在2级道路上行驶5小时，在1级道路上行驶5小时，收费150元。<br />
</span></p>
<p><span style="color: #ff0000"><span style="font-size: medium">请不要提交，未加SPJ。</span></span></p></p><hr/><h3>题目来源</h3><p>By saffah</p>
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